/*
* Copyright (c) Microsoft Corporation. All rights reserved.
* Copyright (c) 2023 Huawei Device Co., Ltd.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file has been modified by Huawei to verify type inference by adding verification statements.
*/

// === tests/cases/compiler/typeParameterLeak.ts ===
declare function AssertType(value:any, type:string):void;
// Repro from #35655

interface Box<T> { data: T }
type BoxTypes = Box<{ x: string }> | Box<{ y: string }>;

type BoxFactoryFactory<TBox> = TBox extends Box<infer T> ? {
  (arg: T): BoxFactory<TBox> | undefined
} : never;

interface BoxFactory<A> {
  getBox(): A,
}

declare const f: BoxFactoryFactory<BoxTypes>;
AssertType(f, "union");

const b = f({ x: "", y: "" })?.getBox();
AssertType(b, "union");
AssertType(f({ x: "", y: "" })?.getBox(), "union");
AssertType(f({ x: "", y: "" })?.getBox, "union");

if (b) {
  const x = b.data;
AssertType(x, "union");
AssertType(b.data, "union");
}


